Homeostasis and Blood Pressure Formative Assessment
The human body responds to physical activity with changes in heart rate, blood pressure, and other physiological changes. These changes support increased demands for energy in the muscles. Scientists studied the effects of exercise on heart rate and blood pressure in two different experiments.
Experiment 1
Scientists measured the blood pressure of 10 normal weight adults ranging in age from 25 to 35. They calculated average blood pressure during 10 minutes of rest, during 10 minutes of light physical activity (walking), and during 10 minutes of moderate physical activity (jogging). The results are shown in Table 1.
Table 1
Average blood pressure | ||
Activity level | Systolic blood pressure (mmHg) | Diastolic blood pressure (mmHg) |
Resting | 119 | 80 |
Light physical activity | 142 | 78 |
Moderate physical activity | 161 | 78 |
Experiment 2
Scientists studied the influence of moderate physical activity on the heart rate of athletes and non-athletes. They measured the heart rate once per minute for five individuals from each group while they jogged on a treadmill for 10 minutes. Resting heart rate was measured once per minute for five minutes before the onset of exercise, and recovering heart rate was measured once per minute for 10 minutes following exercise. The results are shown in Figure 1.
DOK 1
How many total individuals participated in Experiment 2?
DOK2
Which of the following conditions resulted in the highest heart rate in experiment 2?
DOK 3
A scientist claims that strenuous activity, like running, would result in systolic blood pressure measurements over 165 mmHg. Using evidence from Experiment 1, explain why you agree or disagree with this scientists claim.